ABA Telehealth Billing: Why the Federal Rule Did Not Settle Anything

January 2026 brought what looked like the end of a long-running headache. CMS moved every ABA CPT code, meaning 97151 through 97158 plus 0362T and 0373T, onto the permanent telehealth list, retiring years of provisional year-to-year extensions that made planning nearly impossible.

A clinic reading that headline and concluding telehealth was now settled would have spent the rest of the year generating denials. Within the same twelve months, Indiana removed telehealth eligibility from five codes, Vermont narrowed ABA telehealth to three, South Carolina eliminated it for assessment while making two treatment codes permanently eligible, and North Carolina capped telehealth supervision at half of a supervisor's billing per recipient.

The federal list says what Medicare will recognize. It does not say what your payer will pay, and for ABA that distinction is close to everything, since Medicare covers almost no ABA to begin with.

What the federal change actually did

The permanence matters for a specific and limited reason, which is that it removes the annual cliff where clinics had to wait on an extension before planning the next year's service model.

What it does not do is bind commercial payers or state Medicaid programs. Each sets its own telehealth policy independently, and several used 2026 to tighten rather than loosen. A code can sit on the permanent CMS list and be flatly non-covered via telehealth in your state, which is the single most expensive misunderstanding available in this area. It is the same federal-versus-state split that showed up in this year's prior authorization rule, where a national change left most of the practical answer with the individual payer.

Where the state rules actually landed

The 2026 changes do not share a direction, which is what makes a blanket policy impossible.

Indiana disallowed modifier 95 with 97151, 97152, 97153, 97154, and 0373T effective April 1, removing telehealth from most direct service codes. Supervision may still use synchronous telehealth under later guidance when its conditions are met, and the state's telehealth module identifies 97155 and 97156 as the remotely allowed services, requires synchronous audiovisual interaction, bars RBT delivery via telehealth entirely, and requires modifier 95 alongside credential modifiers.

Vermont narrowed ABA telehealth coverage to 97155, 97156, and 97157 effective January 1, and separately stopped allowing concurrent 97153 and 97155 for the same member at the same time.

South Carolina's rewritten provider manual, effective July 1, makes 97156 permanently telehealth-eligible, makes 97155 permanently eligible with prior authorization, and removes 97151 from telehealth entirely.

North Carolina limits telehealth supervision and direction of a paraprofessional to no more than half of that supervisor's services for a single recipient, mapped to 97155, with exceptions available for documented medical necessity or access problems including rural provider shortages.

Commercial payers are generally more consistent with each other, with major carriers commonly covering 97151, 97155, and 97156 via telehealth while excluding 97153. Verify rather than assume, since policies change and plan-level variation exists inside the same carrier.

Getting the claim right

Modifier 95 indicates synchronous telemedicine delivered with real-time audio and video, and it is the default for most payers. Some still require the legacy GT modifier, and the two should never appear on the same claim line. Place of service codes also come into play depending on the payer.

The distinction worth drilling into your team is modifier 93, which indicates audio-only. Billing an audio-only session with modifier 95 is a compliance exposure rather than a coding preference, and it is one of the more common telehealth errors across healthcare generally. If the video failed and the session continued by phone, the documentation and the modifier both have to reflect that, assuming the payer covers audio-only at all, which for ABA many do not.

Several other requirements travel with telehealth delivery in states that permit it. Synchronous audio and video, documentation of both locations, consent and assent where applicable, credential modifiers alongside the telehealth modifier, and an emergency plan all appear in state guidance, and a missing element produces a denial on a session that was otherwise entirely appropriate.

Why this costs more than the denials suggest

Telehealth eligibility is a scheduling decision disguised as a billing rule.

When a state removes telehealth from direct treatment codes, as Indiana did, a clinic that built caseload coverage around remote delivery loses capacity rather than just revenue. Staffing plans, geographic reach into rural areas, and the ability to cover a session when a technician cannot travel all depend on what can actually be delivered remotely and paid for.

The supervision caps carry a similar operational weight. A state limiting telehealth supervision to half a supervisor's services per recipient is effectively setting a floor on BCBA travel, which lands directly in your cost per billable hour.

The practical control is a per-payer, per-code telehealth matrix that the scheduler can see before a session is released, covering which codes are eligible, whether prior authorization is required, which modifier applies, and whether an RBT may deliver remotely. Checking this at the point of scheduling is the only place the check is free.

The rule that applies is your payer's

The useful habit here is treating federal telehealth news as background rather than as guidance. What determines whether a remote session gets paid is the intersection of your state's current bulletin, your specific payer's policy, the code, the rendering provider's credential, and the modality actually used.

That intersection changed several times in 2026 and will change again, which is an argument for a maintained matrix rather than institutional memory. The clinics that absorbed this year's changes cleanly were the ones who checked before scheduling instead of discovering the rule on a remittance six weeks later.

Frequently asked questions about ABA telehealth billing

Which ABA codes can be billed via telehealth in 2026?

All ABA codes are on the permanent CMS telehealth list, but coverage depends on the payer. Most commercial carriers cover 97151, 97155, and 97156 while excluding 97153, and state Medicaid rules vary widely.

What modifier is used for ABA telehealth?

Modifier 95 for synchronous audio and video is standard, with some payers still requiring GT. Modifier 93 indicates audio-only. Never use 95 and GT together.

Can an RBT deliver ABA via telehealth?

In many states no. Indiana's guidance bars RBT delivery through telehealth, and several states exclude the direct treatment code 97153 from telehealth entirely.

Does the CMS permanent telehealth list mean my state covers ABA telehealth?

No. The federal list governs Medicare recognition. State Medicaid programs and commercial payers set their own policies, and several restricted ABA telehealth during 2026.

What happens if we bill an audio-only session with modifier 95?

It misrepresents the service delivered and creates compliance exposure. Audio-only requires modifier 93 where it is covered at all.

If you want to know which of your telehealth claims are exposed under current state and payer rules, that is exactly the kind of gap our financial assessment is built to find.